GB1470036A - Dual range sound absorber - Google Patents

Dual range sound absorber

Info

Publication number
GB1470036A
GB1470036A GB217375A GB217375A GB1470036A GB 1470036 A GB1470036 A GB 1470036A GB 217375 A GB217375 A GB 217375A GB 217375 A GB217375 A GB 217375A GB 1470036 A GB1470036 A GB 1470036A
Authority
GB
United Kingdom
Prior art keywords
horn
sheet
array
core
horns
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB217375A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lockheed Corp
Original Assignee
Lockheed Aircraft Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lockheed Aircraft Corp filed Critical Lockheed Aircraft Corp
Priority to GB217375A priority Critical patent/GB1470036A/en
Publication of GB1470036A publication Critical patent/GB1470036A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating

Abstract

1470036 Sound absorbing laminate LOCKHEED AIRCRAFT CORP 17 Jan 1975 2174/75 Heading B5N [Also in Divisions G5 and H3] A wide range sound absorber comprises an impermeable backing sheet 1, a core of orthogonally intersecting portions 2, 3, an array 4 of tapered horns 5, and may have a permeable facing sheet 11, all of which are bonded together, e.g. by an adhesive. The mouths of the horns 5 may be circular, square or rectangular and may be above, flush with or below the top of said core. The narrow throat of the horn in the embodiment of Fig. 1 is spaced from the backing sheet 1 but in other embodiments said throat contacts the sheet 1 and an aperture is provided in the horn (Figs. 3, 4, not shown). The array 4 is preferably made from vacuumformed plastics, and the facing sheet 11 from fibre metal, perforated metal, porous paper, porous ceramic or other suitable material having a flow resistance of the order of 1 pc (p and c respectively being the density of and velocity of sound in the propagating fluid medium). The shape of the horn may be exponential, hyperbolic, catenoidal, Bessel or conical.
GB217375A 1975-01-17 1975-01-17 Dual range sound absorber Expired GB1470036A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB217375A GB1470036A (en) 1975-01-17 1975-01-17 Dual range sound absorber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB217375A GB1470036A (en) 1975-01-17 1975-01-17 Dual range sound absorber

Publications (1)

Publication Number Publication Date
GB1470036A true GB1470036A (en) 1977-04-14

Family

ID=9734870

Family Applications (1)

Application Number Title Priority Date Filing Date
GB217375A Expired GB1470036A (en) 1975-01-17 1975-01-17 Dual range sound absorber

Country Status (1)

Country Link
GB (1) GB1470036A (en)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2300081A (en) * 1995-04-20 1996-10-23 Dornier Gmbh Acoustic absorber
US5760349A (en) * 1995-04-20 1998-06-02 Dornier Gmbh Acoustic absorber having a slotted horn arranged in a pot
GB2341742A (en) * 1998-09-21 2000-03-22 Blast Loudspeakers Limited An acoustic absorber or emitter
WO2005091272A1 (en) * 2004-03-17 2005-09-29 Eads Deutschland Gmbh Assembly for reducing noise in turbofan engines
WO2011082510A1 (en) * 2010-01-08 2011-07-14 中国科学院声学研究所 Compound sound absorption device with built-in resonant cavity
WO2015023389A1 (en) * 2013-08-12 2015-02-19 Hexcel Corporation Sound wave guide for use in acoustic structures
EP2846030A1 (en) * 2013-08-30 2015-03-11 Airbus Defence and Space GmbH Sound absorber, sound absorber assembly and an engine with a sound absorber assembly
WO2015026421A3 (en) * 2013-07-29 2015-04-09 The Boeing Company Septumization of honeycomb sandwiches
KR20160043057A (en) * 2013-08-12 2016-04-20 헥셀 코포레이션 Noise absorbing structure comprising a honeycomb with an internal septum
EP2605238A3 (en) * 2011-12-13 2016-11-02 Rolls-Royce Deutschland Ltd & Co KG Acoustic absorber
CN107610688A (en) * 2017-09-05 2018-01-19 上海声望声学科技股份有限公司 A kind of compound sound insulating structure of lumen
FR3055662A1 (en) * 2017-04-24 2018-03-09 Airbus Operations (S.A.S.) INTERNAL STRUCTURE OF A PRIMARY EJECTION DUCT OF A TURBOMACHINE COMPRISING AN ABSORBENT STRUCTURE OF LOW FREQUENCY SOUNDS
CN109147750A (en) * 2018-11-15 2019-01-04 中车株洲电力机车有限公司 A kind of low frequency coupling sound absorption structure
FR3078431A1 (en) * 2018-02-28 2019-08-30 Airbus Operations SOUNDPROOFING COATING COMPRISING AN ALVEOLAR STRUCTURE WITH CURVED CELLS SHAPED ON EITHER OF THE SAME INTERNAL WALL
BE1026313B1 (en) * 2018-07-20 2019-12-23 Houtbuigerij G Desmet Nv SOUND-ABSORBABLE PANEL AND METHOD FOR MANUFACTURING SUCH SOUND-Absorbing PANEL
CN111099010A (en) * 2017-08-29 2020-05-05 Mra***有限责任公司 Acoustic liner, method of forming the same, and aircraft engine assembly having the acoustic liner
CN111354329A (en) * 2018-12-24 2020-06-30 空中客车运营简化股份公司 Method for manufacturing a sound-absorbing structure comprising a honeycomb panel with integrated acoustic elements and sound-absorbing structure obtained by this method
EP3696090A1 (en) * 2019-02-14 2020-08-19 Airbus Operations (S.A.S.) Method for manufacturing an acoustic absorption structure including a skin forming a plurality of enclosures, acoustic absorption structure obtained according to said method and aircraft comprising said acoustic absorption structure
WO2020174192A1 (en) * 2019-02-28 2020-09-03 Safran Nacelles Method for creating alveolar cores having open inner conical shapes
FR3099963A1 (en) * 2019-08-13 2021-02-19 Airbus Operations Acoustic element with double enclosure and reduced bulk, in particular for aircraft acoustic panels
WO2021176182A1 (en) * 2020-03-04 2021-09-10 Safran Nacelles Method for manufacturing a structure with cellular cores for a turbojet nacelle

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2300081A (en) * 1995-04-20 1996-10-23 Dornier Gmbh Acoustic absorber
US5760349A (en) * 1995-04-20 1998-06-02 Dornier Gmbh Acoustic absorber having a slotted horn arranged in a pot
GB2300081B (en) * 1995-04-20 1998-11-18 Dornier Gmbh Acoustic absorber
GB2341742A (en) * 1998-09-21 2000-03-22 Blast Loudspeakers Limited An acoustic absorber or emitter
GB2341742B (en) * 1998-09-21 2003-04-23 Blast Loudspeakers Ltd Acoustic absorber and emitter
WO2005091272A1 (en) * 2004-03-17 2005-09-29 Eads Deutschland Gmbh Assembly for reducing noise in turbofan engines
JP2007529666A (en) * 2004-03-17 2007-10-25 エーアーデーエス・ドイッチェランド・ゲゼルシャフト ミット ベシュレンクテル ハフツング Noise reduction structure in turbofan engine
US7819224B2 (en) 2004-03-17 2010-10-26 Eads Deutschland Gmbh Assembly for reducing noise in turbofan engines
JP4659021B2 (en) * 2004-03-17 2011-03-30 エーアーデーエス・ドイッチェランド・ゲゼルシャフト ミット ベシュレンクテル ハフツング Noise reduction structure in turbofan engine
WO2011082510A1 (en) * 2010-01-08 2011-07-14 中国科学院声学研究所 Compound sound absorption device with built-in resonant cavity
EP2605238A3 (en) * 2011-12-13 2016-11-02 Rolls-Royce Deutschland Ltd & Co KG Acoustic absorber
US10363726B2 (en) 2013-07-29 2019-07-30 The Boeing Company Septumization of honeycomb sandwiches
WO2015026421A3 (en) * 2013-07-29 2015-04-09 The Boeing Company Septumization of honeycomb sandwiches
US9643392B2 (en) 2013-07-29 2017-05-09 The Boeing Company Septumization of honeycomb sandwiches
CN105493176A (en) * 2013-08-12 2016-04-13 赫克赛尔公司 Sound wave guide for use in acoustic structures
KR20160043056A (en) * 2013-08-12 2016-04-20 헥셀 코포레이션 Sound wave guide for use in acoustic structures
KR20160043057A (en) * 2013-08-12 2016-04-20 헥셀 코포레이션 Noise absorbing structure comprising a honeycomb with an internal septum
JP2016532155A (en) * 2013-08-12 2016-10-13 ヘクセル コーポレイション Sound waveguide for use in acoustic structures
AU2014307026B2 (en) * 2013-08-12 2017-04-20 Hexcel Corporation Sound wave guide for use in acoustic structures
KR102228528B1 (en) 2013-08-12 2021-03-15 헥셀 코포레이션 Sound wave guide for use in acoustic structures
WO2015023389A1 (en) * 2013-08-12 2015-02-19 Hexcel Corporation Sound wave guide for use in acoustic structures
KR102228530B1 (en) 2013-08-12 2021-03-15 헥셀 코포레이션 Noise absorbing structure comprising a honeycomb with an internal septum
EP2846030A1 (en) * 2013-08-30 2015-03-11 Airbus Defence and Space GmbH Sound absorber, sound absorber assembly and an engine with a sound absorber assembly
US9303588B2 (en) 2013-08-30 2016-04-05 Airbus Defence and Space GmbH Sound absorber, sound absorber assembly and an engine with a sound absorber assembly
FR3055662A1 (en) * 2017-04-24 2018-03-09 Airbus Operations (S.A.S.) INTERNAL STRUCTURE OF A PRIMARY EJECTION DUCT OF A TURBOMACHINE COMPRISING AN ABSORBENT STRUCTURE OF LOW FREQUENCY SOUNDS
CN111099010A (en) * 2017-08-29 2020-05-05 Mra***有限责任公司 Acoustic liner, method of forming the same, and aircraft engine assembly having the acoustic liner
CN111099010B (en) * 2017-08-29 2023-11-10 Mra***有限责任公司 Acoustic liner, method of forming the same, and aircraft engine assembly having the acoustic liner
CN107610688B (en) * 2017-09-05 2024-04-26 同济大学 Cavity tube composite sound insulation structure
CN107610688A (en) * 2017-09-05 2018-01-19 上海声望声学科技股份有限公司 A kind of compound sound insulating structure of lumen
US11268478B2 (en) 2018-02-28 2022-03-08 Airbus Operations Sas Sound-proofing covering comprising a cellular structure with curved cells formed on either side of one and the same inner wall
EP3534360A1 (en) * 2018-02-28 2019-09-04 Airbus Operations S.A.S. Soundproofing coating comprising a honeycomb structure with curved cells formed on either side of a single inner wall
FR3078431A1 (en) * 2018-02-28 2019-08-30 Airbus Operations SOUNDPROOFING COATING COMPRISING AN ALVEOLAR STRUCTURE WITH CURVED CELLS SHAPED ON EITHER OF THE SAME INTERNAL WALL
BE1026313B1 (en) * 2018-07-20 2019-12-23 Houtbuigerij G Desmet Nv SOUND-ABSORBABLE PANEL AND METHOD FOR MANUFACTURING SUCH SOUND-Absorbing PANEL
CN109147750A (en) * 2018-11-15 2019-01-04 中车株洲电力机车有限公司 A kind of low frequency coupling sound absorption structure
CN111354329A (en) * 2018-12-24 2020-06-30 空中客车运营简化股份公司 Method for manufacturing a sound-absorbing structure comprising a honeycomb panel with integrated acoustic elements and sound-absorbing structure obtained by this method
EP3696090A1 (en) * 2019-02-14 2020-08-19 Airbus Operations (S.A.S.) Method for manufacturing an acoustic absorption structure including a skin forming a plurality of enclosures, acoustic absorption structure obtained according to said method and aircraft comprising said acoustic absorption structure
FR3092844A1 (en) * 2019-02-14 2020-08-21 Airbus Operations (S.A.S.) A method of making an acoustic absorption structure comprising a skin forming a plurality of enclosures, an acoustic absorption structure obtained by said method and an aircraft comprising said acoustic absorption structure
FR3093374A1 (en) * 2019-02-28 2020-09-04 Safran Nacelles Process for the development of alveolar cores with open internal conical shapes
CN113490978A (en) * 2019-02-28 2021-10-08 赛峰短舱公司 Method for manufacturing honeycomb core having open internal conical shape
EP3931821A1 (en) * 2019-02-28 2022-01-05 Safran Nacelles Method for creating alveolar cores having open inner conical shapes
WO2020174192A1 (en) * 2019-02-28 2020-09-03 Safran Nacelles Method for creating alveolar cores having open inner conical shapes
FR3099963A1 (en) * 2019-08-13 2021-02-19 Airbus Operations Acoustic element with double enclosure and reduced bulk, in particular for aircraft acoustic panels
FR3107856A1 (en) * 2020-03-04 2021-09-10 Safran Nacelles Manufacturing process of a honeycomb core structure for a turbojet nacelle
WO2021176182A1 (en) * 2020-03-04 2021-09-10 Safran Nacelles Method for manufacturing a structure with cellular cores for a turbojet nacelle

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee